# include <iostream>
# include <cmath>
//定义有返回值的自定义函数
double func1(double);
int func2(int);
int main()
{
using namespace std;
cout << "C++:定义有返回值的func2函数。" << endl;
cout << "将英石（stone）转换为磅（pound），"
<< "请输入英石：";
int stone;
cin >> stone;
int pounds = func2(stone);//调用func2函数
cout << "调用函数结束。" << stone << "英石"
<< "=" << pounds << "磅。" << endl;
cout << "C++:sqrt开方函数。" << endl;
double text1;
cout << "请输入需要开方的数值，类型：double:" << endl;
cin >> text1;
double answer = sqrt(text1);
cout << "开方后得" << answer << "。程序结束。"<<endl;
cout << "C++:sin函数值计算。" << endl;
cout << "请为sin(x)的x赋值：";
double sintext;
cin >> sintext;
double sinanswer;
sinanswer = func1(sintext);
cout << "计算结果为：" << sinanswer << endl;
system("pause");
return 0;
}
int func2(int n)
{
return 14 * n;
}
double func1(double s)
{
return sin(s);
}